[Debian-med-packaging] Bug#916907: pyscanfcs: fails to install (found by autopkgtest)

[Paul Gevers]

Source: pyscanfcs
Version: 0.3.2+ds-1
User: debian-ci at lists.debian.org
Usertags: needs-update
Severity: serious
Control: affects -1 src:python3-defaults

[X-Debbugs-CC: debian-ci at lists.debian.org,
python3-defaults at packages.debian.org]

Dear maintainers,

With a recent upload of python3-defaults the autopkgtest of pyscanfcs
fails in testing when that autopkgtest is run with the binary packages
of python3-defaults from unstable. It passes when run with only packages
from testing. In tabular form:
                       pass            fail
python3-defaults       from testing    3.7.1-3
pyscanfcs              from testing    0.3.2+ds-1
all others             from testing    from testing

I copied some of the output at the bottom of this report. It seems your
package embedded the python3 supported versions in the file
/usr/share/python3/runtime.d/pyscanfcs.rtupdate while it doesn't
guarantee that the required packages are installed. I may be wrong, but
I think that file could  $(py3versions -vi) or something along those
lines. I have the feeling that the error message may be confusing, as I
see python3.6 installed so maybe (just maybe) the error should read
"unsupported version".

Currently this regression is contributing to the delay of the migration
of python3-defaults to testing [1]. Of course, python3-defaults
shouldn't just break your autopkgtest (or even worse, your package), but
that the change in python3-defaults was intended and your package needs
to update to the new situation.

More information about this bug and the reason for filing it can be found on
https://wiki.debian.org/ContinuousIntegration/RegressionEmailInformation

Paul

[1] https://qa.debian.org/excuses.php?package=python3-defaults

https://ci.debian.net/data/autopkgtest/testing/amd64/p/pyscanfcs/1549682/log.gz

Setting up python3.6 (3.6.8~rc1-1) ...
Setting up gsettings-desktop-schemas (3.28.1-1) ...
Setting up python3 (3.7.1-3) ...
E: py3compile:243: Requested versions are not installed
error running python rtupdate hook pyscanfcs

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